Sd.Kfz 301 “Borgward”
In October 1941, Borgward was order to develop the B III VK 302 to a schwere ladungsträger - B IV Sd. Kfz. 301 and, from the experiences with the B I and B II, a leichter ladungstraeger Goliath Sd. Kfz. 302.
Known as the B IV, it was designated by the Waffenamt as Sprengladungsträger ( explosive charge carrier) (Sd. Kfz. 301).

The Sd. Kfz. 301 Borgward IV measured 3.65m in length, 1.8m in width and 1.19m in height. It weighed 3.6 tons and used the same engine as VK 302, giving it a maximum speed of 38km/h. It had a one-man crew, who drove the vehicle to the launch spot before engaging the enemy. Thereafter the 8mm protection plates around the driver was folded down to protect the radio and then the vehicle was radio-controlled towards the target. When engaging the enemy, a 500kg explosive charge carried on the frontal armor plate was offloaded.
The vehicle backed away and the explosive charge was set off with delayed detonation. Some 12 experimental vehicles were built in April 1942. Series production began in May 1942 and approximately 616 Borgward IV Ausf. A were built until June 1943, the Ausf. B being built in 260 examples until November 1943 and some 305 Ausf. C were built from December 1943 to September 1944.

The Ausf. B only differed a little from the Ausf. A, it weighed 400kg more, the radio antennae was moved and the radio-equipment had been improved. Borgward IV Ausf. C weighed 4.85tons, measured 4.1m in length, 1.83m in width and 1.25m in height. It carried thicker armor and used new tracks. The drivers position were moved from right to the left side. It also used a more powerful Borgward engine, providing some 78hp.